Michelle is 7 years older than her sister joan, and joan is 3 years younger than their brother ryan. if the sum of their ages is 64, how old is joan?

 Joan is 18 years old.

Step-by-step explanation:

Let x be the present age of Ryan.

Then  age of Joan = x-3.

Age of Michelle = (x-3)+7=x-3+7=x+4

Also, the of their ages is 64, then we have the following equations ;_

Now, The age of Joan = x-3= 21-3=18

Hence, Joan is 18 years old.

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph